standard transmissions
New User
Joined: Jun 2006
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IMO, stick trannies are better suited for the higher HP created by DP tunes. Manuals are just made up of gears and shafts that have physical limitations as opposed to auto's which have pumps, clutches, torque converters, ect. Think of a manual as a multi-geared differential.
Senior User
Joined: Apr 2004
Posts: 349
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From: Port Murray, NJ
I think all aluminum case manual transmissions are weak. They don't seem to stand the test of time. Which I think is pretty disapponting. You maybe better than a stock automatic trans if you are comparing the two side by side. But a built auto trans is superior to anything manual IMHO.
Senior User
Joined: Apr 2004
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From: Port Murray, NJ
The trans has been rebuilt by the previous owner of the truck. Not sure why cause I don't have the history of the truck. I think it pulled a landscape trailer fairly regularly. I'm under the impression(and this is my opinion) that the car manufacturer's don't build anything to last really more than 5 years. Everything is disposable. They build it just long enough to last no matter how well you do the routine maintenance. We pay a lot of money for these trucks and we still have to add auxilary trans coolers and such to prolong their life. They just don't build them like they used to. Just my thoughts.
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Elder User
Joined: Oct 2004
Posts: 916
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From: Hazelton,BC Canada
well that is true that they dont build em likethey used to, but im sure you can squeeze a little more than 5 years out of a pickup
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Senior User
Joined: Apr 2004
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From: Port Murray, NJ
I'm hoping to squeeze the rest of my years out of this truck! 
Just hope the major components stay together. Keep changing the fluid in that manual trans. Swtching to synthetic soon. I've heard good things about putting synthetic trans fluid from people on FTE. Good luck.
Just hope the major components stay together. Keep changing the fluid in that manual trans. Swtching to synthetic soon. I've heard good things about putting synthetic trans fluid from people on FTE. Good luck.
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Joined: Jun 2006
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Originally Posted by crack
about the only weak point would be the clutch I guess
The clutch has been determined to be the weakest link because of a spring/clutch disc design flaw. As wilber mentioned, the aluminum case is weaker than it's cast iron predecessor, however, the tranny case on these trucks is huge, and by the looks of it, I would say they are very stong. I have not heard of a tranny malfunction attributed to a weak case.
I personally like my 6spd manual. My previous truck had the np435 tranny that really only had 3 useable gears. This 6spd is by far a better transmission than the NP and definitely operates in a much higher horse power range.
My experience with Ford auto trannies leads me to believe that if you compare a properly maintained stock 6spd and properly maintained stock auto with equal usage and conditions, your auto will require a rebuild in half the mileage of the 6spd.
Just my $0.02
Elder User
Joined: Oct 2005
Posts: 786
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From: Reno nv
well the book says the zf is good for 530 ft lbs on the input shaft, and one can probalbly squeeze perhaps 650 and still get by. Pretty sure the clutch will slip before that, and I am worries that the drive shaft will wind up looking like a pretzel way before that.
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Elder User
Joined: Oct 2004
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From: Hazelton,BC Canada
did it seem to you when you first got your diesels with standard trannys that the clutch was "all at the bottom" meaning that as soon as you start to let the clutch out your moving? Im not sure if its the way the clutch is on this particular truck or if im just too used to gas jobs
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Joined: Oct 2004
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From: Morgantown WV
I put down 810ft tq before I added the new turbo this year. I've broke my fair share of parts but never the trans or drive shaft. If you want to play by the book buy a 550. I've got 40+ hooks and 20k+ miles at or above the 810tq.
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From: Morgantown WV
Originally Posted by crack
did it seem to you when you first got your diesels with standard trannys that the clutch was "all at the bottom" meaning that as soon as you start to let the clutch out your moving? Im not sure if its the way the clutch is on this particular truck or if im just too used to gas jobs
